The types.py file has four types, listed below, that don't have any stubs at all. At least one of these is used in the inspect modules, and the lack of these stubs makes writing more reflection code and such quite annoying.

• WrapperDescriptorType
• MethodWrapperType
• MethodDescriptorType
• ClassMethodDescriptorType

I'd be willing to make and PR a fix, if others agree that these types should be added.